CVE-2026-87017: Open WebUI exposes inaccessible knowledge bases via vector search

# CVE-2026-87017: Open WebUI exposes inaccessible knowledge bases via vector search

https://gcdradar.vercel.app/incidents/cve-2026-87017-open-webui-exposes-inaccessible-knowledge-bas · AIR-2026-0927 · closed 2026-09-09

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-09-09 (happened 2026-09-10)
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-87017
- CVSS: 4.3

## Summary

A vulnerability in Open WebUI causes the built-in knowledge search tool to bypass access controls and return matches from unassigned knowledge bases on vector backends. No active exploitation has been reported.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-09-10: CVE-2026-87017: Open WebUI: Inaccessible knowledge bases are exposed through the built-in knowledge tool on most vector backends (https://github.com/advisories/GHSA-pcvc-8vrv-8q6w)
- 2026-09-09: CVE-2026-87017: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. (https://nvd.nist.gov/vuln/detail/CVE-2026-87017)

## Sources

- 2026-09-09 NVD: CVE-2026-87017: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. https://nvd.nist.gov/vuln/detail/CVE-2026-87017
- 2026-09-10 GitHub Advisory Database: CVE-2026-87017: Open WebUI: Inaccessible knowledge bases are exposed through the built-in knowledge tool on most vector backends https://github.com/advisories/GHSA-pcvc-8vrv-8q6w

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.